Capacitive & Projected Capacitive Technology
Product Announcement from Esterline Interface Technologies
A capacitive panel is a sensor typically made with a transparent conductor such as indium tin oxide (ITO). This type of sensor is basically a capacitor in which the plates are the overlapping areas between the horizontal and vertical axes in a grid pattern. Since the human body also conducts electricity, a touch on the surface of the sensor will affect the electric field and create a measurable change in the capacitance of the device. These sensors work on proximity of the conductive medium (finger), and do not have to be directly touched to be triggered. It is a durable technology that is used in a wide range of applications including point-of-sale systems, industrial controls, and public information kiosks.
Projected Capacitive Touch (PCT) technology is a type of capacitive technology which involves the relationship between an XY array of sensing wires embedded within two layers of non-metallic material, and a third object. In touchscreen applications the third object can be a human finger. Projected capacitance creates an electrostatic field above the sensing surface to determine inputs. This format requires the use of patterned ITO and requires no calibration. Capacitance forms between the user's fingers and projected capacitance from the sensing wires. A touch is made, precisely measured, then passed on to the controller system which is connected to a computer running a software application. This will then calculate how the user's touch relates to the computer software. PCT screens enjoy the benefits of responding accurately to both fingers and styli.
Contact us today to work this technology into your custom user interface. Advanced Input Systems, when off-the-shelf won't do!